Monitoring & Critical Care MCQs

Anaesthesia · 6 free questions with answers & explanations.

1. A 62-year-old patient is mechanically ventilated after a laparotomy. Arterial blood gas shows: pH 7.28, PaCO2 52 mmHg, PaO2 88 mmHg, HCO3 24 mEq/L on FiO2 0.5. What is the PRIMARY acid-base disturbance?
2. On pulse oximetry, carboxyhaemoglobin (COHb) results in SpO2 readings that are:
3. A patient's central venous pressure waveform shows a prominent 'cv' wave with obliteration of the 'x' descent. Which valvular abnormality is MOST consistent with this finding?
4. The Bispectral Index (BIS) monitor value of 40 in an anaesthetised patient indicates:
5. A postoperative ICU patient develops bilateral lung infiltrates, a P/F ratio of 180 mmHg, and requires FiO2 0.6 with PEEP 10 cmH2O. There is no evidence of cardiogenic oedema. Which diagnosis BEST fits, and what lung-protective ventilation tidal volume target is recommended?
6. During intraoperative transoesophageal echocardiography (TOE), a new regional wall motion abnormality (RWMA) is noted in the anterolateral wall. Which coronary artery territory is MOST likely affected?